Per Gudmundson, born 1955, is a Swedish folk musician. He plays the fiddle and has also been instrumental in the revival of the Swedish bagpipes in Swedish folk music together with instrument maker Le
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385072fd6859ec95d321bac97cc0f3be68d7116ea3ec9b6d482b01060cf9f184. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d20e3a9-2ff5-4bfa-8900-a06412a504fa.json and https://artists.proofprofile.net/proofs/artist/0d20e3a9-2ff5-4bfa-8900-a06412a504fa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).